Parent Blood Type Calculator

Child Blood Type:
One Parent Blood Type:
Other Parent Blood Type:

If you know the children's blood type, you could calculate Parent's Blood Type

The result +/- is called the rhesus factor, with - being recessive, and + being dominant. When parents are -, then kids are -, otherwise the kids might be + or -.

The table below shows the possible:

Child's Blood Type
A B AB O
One
Parent's
Blood
Type
A A/B/AB/O B/AB B/AB A/B/O
B A/AB/O A/B/AB/O A/AB A/B/O
AB A/B/AB/O A/B/AB/O A/B/AB Impossible
O A/AB B/AB Impossible A/B/O
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